Răspuns: 34
Explicație pas cu pas:
[tex]\bf x^2 - 2x - 15 = 0[/tex]
[tex]\bf x^2 +3x -5x - 15 = 0[/tex]
[tex]\bf x\cdot(x+3) -5\cdot(x +3) = 0[/tex]
[tex]\bf (x+3) \cdot(x -5) = 0[/tex]
[tex]\bf (x+3) = 0 \implies \blue{\underline{x_{1}=-3}}[/tex]
[tex]\bf (x-5) = 0 \implies \blue{\underline{x_{2}=5}}[/tex]
[tex]\bf \red{\underline{Suma ~patratelor}}: (-3)^2+5^2=9+25=\red{\underline{34}}[/tex]
==pav38==
